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echo 8000...porting ideas?

spencerpaving

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I picked up a 8000 pretty reasonable and it runs decent but is a little lacking...I just tore it down first thing I spotted was a tiny carb...next ran the numbers on the engine...the timing is very conservative ex 108* Trans 120* intake 68* squish .060 and the comp 155lbs. I think I can mount a 460 carb on it without much hassle...as for porting I think I'm gonna start with ex 103 trans keep them at 120 and the intake at 77-78...and see if it can come alive....ok guys let's here your thoughts
 

Cobby08

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I was about to respond with ask spencerpaving, as he is building one for the April GTG... Sub'd as I got a project 6700 I horse traded favors and all. Just got a 8000 carb, boy, should of waited lol


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spencerpaving

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I will pull the cyl tommorrw night and get some pics...I'm open to all suggestions to get this underdog to run...trying to keep in my mind the longer stroke of this engine might make things different :confused:
 

jake wells

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echo has a kit available with a updated cylinder and piston to give it more performance. base gasket delete
and taking some off the base and a muffler mod really makes a difference in these saws. they can run a 9 pin with a 24'' no problem
they are know more for there torque than anything. wide open throttle is 12,500 on that saw the new cs-800p with the updated top end and ignition system is 13,500.
 

jake wells

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these saws have no trouble with a 30'' on them and oiling is not a problem with a automatic pump w/ manual over ride.
 

spencerpaving

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Welll.....after going in this thing and seeing what it's all about I know why these things are underated. I went lightly the first go around "little steps" changed port timing to what was mentioned and bumped compression. The saw ran very strong but seemed like it was hitting a Rev liter even dogging the saw real hard was still stuttering. So I tried to find a diff coil that would work but no dice. So I figured to I'm stuck there ...ready to give up I mounted a 460 carb on it to see what happens.....holy *s-word did that wake it up it was never the coil it just couldn't breath!it now turns 14500 without a problem...but I'm still not fully happy...it's apart now for a little more porting and a tad more comp. The one prob that is hurting is the ex port...the casting isn't thick enough to grind it as wide as I would like to go...but things are looking promising ...can I get it to run with a ported 390? I don't know but I'm trying...stay tuned:cool:
 

Four Paws

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That's an exciting update! Glad to hear you are still engaged and enthused with the project!
 

spencerpaving

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spencerpaving

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stock intake...I'll take more pics before I put it back together

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ft. churchill

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About a month ago I just did a cs-8000. It was my buddies and I did not think much of the saw having run it in big pine (40") logs at 8000' It was about equal in power to my 372 stock with just a muff mod. There was two MMWS 372's there and thank spanked it in the big wood. Sorry I did not take pics, but I did a base gasket delete, and took twice the thickness of the base gasket off of the top of the exhaust port, then removed all of the baffling you'll find in the muffler area at the spark aresstor screen. Just ran the outer deflector plate and threw out the screen and it's support plate and opened up the muffler under the screen to the maximum area you can. It was such an improvement that I had to put the screen back in as the carb could barely keep up with main jet flow. It was 3 /12 to four turns open. It runs fantastic and my buddy is thrilled with the results.
 
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